Again, there's a lot more ducks in the pond than one can normally see.
If you are an artist/artizen of some repute, yes your name is worth something. It may make it worth more, or less, as times and fashion changes. A swamped 28" 32 cal in a full length dark red stock would have been vastly more popular 20 years ago than now. Show up with a 20" 50 cal FrankenHawken in a "sported" plaid plastic stock with a bird cage flash hider and you'll have a few fans- these days.
Did your work get better or worse as you aged? Some folks even get a little odder as time and experience progresses. Do all those curlicues in your brackets do anything? Or that pastel camo job?
But, the thing is these signed things will be worth more after you're gone. You made 39? I know you could make #40 if you felt like it. There be very little artists who get rich while they're alive. Once they're gone- their product is now a set finite amount, and "new" can only mean a copy or a set aside. Sometimes a little hype goes a long way, also, for bringing about value. But only after you've gone on.
Which brings us here: how much for a gun, how old are you and where do you live?